/*    $OpenBSD: strcspn.c,v 1.5 2005/08/08 08:05:37 espie Exp $ */
/*-
 * Copyright (c) 1990 The Regents of the University of California.
 * All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Chris Torek.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */


/****************************************************************************
 * Compilation Switches
 ****************************************************************************/

/****************************************************************************
 * Included Files
 ****************************************************************************/

#include "string.h"

/*****************************************************************************
 Function         :  strcspn
 Description      :  Finds the first sequence of characters in the string str1
                   that does not contain any character specified in str2.
 Input            :  [1] const char *str1, A pointer of string;
                    [2] const char *str2, A pointer of string.
 Output           :  nothing.
 Return           :  The length of this first sequence of characters found that
                   do not match with str2.
 *****************************************************************************/

size_t strcspn(const char *s1, const char *s2)
{
    const char *p, *spanp;
    char c, sc;

    /*
     * Stop as soon as we find any character from s2.  Note that there
     * must be a NUL in s2; it suffices to stop when we find that, too.
     */
    for (p = s1;;) {
        c = *p++;
        spanp = s2;
        do {
            if ((sc = *spanp++) == c)
                return (p - 1 - s1);
        } while (sc != 0);
    }
    /* NOTREACHED */
}
